Although Snowball spent most of his time supervising the teaching of the other animals, and Squealer persisted in spreading the good word about the brainwork of the pigs, it was Boxer who gained the respect of the working animals.
Boxer was the admiration of everyone... now he seemed more like three horses than one.
Boxer's incredible strength was a marvel to all of the animals. He worked from early in the morning till late at night; he had a cockerell call him each morning so he could begin work a half hour before anyone else. He volunteered whenever he could, and he adopted a personal motto that fit him perfectly: "I will work harder!"
In Orwell's Animal Farm, the animals begin to work the land and find it frustrating as the machinery and tools were designed for men and not for animals. However, they have a great deal of respect for the pigs who were extremely "clever" and seem to work out any kind of problem. (The pigs don't do any work, but direct the other animals.) The horses understand mowing and raking better than the humans ever had.
Boxer has the strength of three horses, and works very hard. He wakes a half hour earlier than anyone else to get an early start, and in the face of any challenge, his response was,
I will work harder!
Everyone except the cat seems to assume some responsibility, even the hens and the ducks, based upon their strength and capacity to understand.
If I had to decide which animal is admired the most, it would be Boxer. His work ethic is admirable and his service to the rest of the community never wavers. When more is required of him, he tries harder.
(However, if I were to identify which animals were the most powerful, it would be the pigs.)